EWG's Guide to
Healthy Cleaning

Find products and ingredients Learn how the Guide works Discover EWG VERIFIED®

HOME / Hard Water Stain Remover / Clr calcium, lime, & rust remover


CLR Calcium, Lime, & Rust Remover


When you make a purchase through retailer links on our site, we may earn commission through affiliate programs. All affiliate fees EWG receives support our nonprofit mission. Learn more here


Hard Water Stain Remover




January 21, 2020

Ingredient concerns

See how this product scores for common concerns.

Health Concerns

  • No Data
    Asthma / Respitory
  • LOW
    Skin Allergies & Irritation
  • LOW
    Developmental & Reproductive Toxicity
  • No Data
  • LOW

Ingredient scores

Ingredient Disclosure: good

Ingredients are scored based on their formulation and concentration in this product. Click on an ingredient for more information.

Ingredients from the label

Water, Lactic Acid, Gluconic Acid, Lauramine Oxide, Tripropylene Glycol n-Butyl Ether, Blue 1, Yellow 5

Directions from Packaging

HOUSEHOLD GLOVES RECOMMENDED; HOW TO USE CLR Calcium Lime and Rust Product: ALWAYS SPOT TEST ON A HIDDEN SURFACE FIRST before beginning any cleaning job. May etch older sinks, tubs and tiles. Always avoid prolonged contact with any surface. After 2 minutes, rinse promptly and thoroughly with cold clean water. ; Showerhead, Toilets, Tubs, Sinks, Porcelain, Stucco, Vinyl Siding, Brick, Coffeepots, Tea Kettles, and Humidifiers: Mix equal parts (50/50 CLR) to water solution) for light stains/build-up. Repeat as necessary. Use full strength for stubborn stains/build-up. After 2 minutes, rinse promptly and thoroughly with cold clean water.; Concrete: Use per instructions above but do not use on colored concrete, concrete under 1 year old, or on sealed or stamped concrete. Due to various compositions of concrete a lightening or darkening may occur. After 2 minutes, rinse promptly and thoroughly with cold water.; Coffeemakers: Refer to your coffee maker manual cleaning directions first. Mix 1 part CLR product to 8 parts water, remove filter, run through cycle. Rinse well with 4 pots of water. DO NOT USE in coffeemakers that hold water permanently including espresso, Gevalia or Keurig machines. See website for more detailed instructions. Washing machine/ Dishwaters: add 1/2 cup to an empty machine on normal cycle. Run another cycle empty with just water to rinse.


WARNING: KEEP OUT OF REACH OF CHILDREN.; DO NOT USE ON Natural Stone/ Marble, terrazzo, colored grout, metallic/painted/coated/sealed surfaces, steam irons/steamers/steam machines, ANY damaged or cracked surfaces, brass/copper/aluminum, galvanized metal, clothing/fabric/carpeting, wallpaper, refined bathtubs, wood, colored concrete, concrete less than 1 yr. old, sealed or stamped concrete ; WARNING: HARMFUL IF SWALLOWED. EYE IRRITANT. VAPOR MAY BE HARMFUL. DO NOT MIX WITH OTHER HOUSEHOLD CLEANERS OR CHEMICALS INCLUDING BLEACH, AS TOXIC FUMES MAY RESULT. DO NOT REUSE EMPTY BOTTLE. KEEP OUT OF REACH OF CHILDREN. Use in well ventilated area. In case of contact with skin or eyes, flush with cool water for 15 minutes. Call physician if irritation continues. If swallowed, do not induce vomiting; drink a glass of water followed with milk. Call a physician immediately.

This product is a certified green cleaner.

Safer Choice

Safer Choice is a voluntary program overseen by the U.S. Environmental Protection Agency. The agency certifies products, including household cleaners, that meet their criteria for human and environmental safety. Companies may carry the Safer Choice Seal if they formulate products with ingredients that meet standards developed through the program. Acceptable ingredients receive a green circle (low concern based on experimental and modeled data), a green half-circle (low concern based on experimental and modeled data, but with some data gaps), or a yellow triangle (some hazard concern).

Web: http://www.epa.gov/saferchoice


Leading international certifiers PETA and Leaping Bunny have no information concerning this company’s use of animal testing.

Understanding scores

EWG provides information on cleaning product ingredients from the published scientific literature, to supplement incomplete data available from companies and the government. The ratings indicate the relative level of concern posed by exposure to the ingredients in this product - not the product itself - compared to other product formulations. The ratings reflect potential health hazards but do not account for the level of exposure or individual susceptibility, factors which determine actual health risks, if any.


Hazard score

The Healthy Cleaning ingredient hazard score, from A to F, reflects known and suspected hazards linked to the ingredients. The EWG VERIFIED® mark means a product meets EWG’s strictest criteria for transparency and health.

Score legend

Other formulations for CLR Calcium, Lime, & Rust Remover

More Hard Water Stain Remover

VIEW ALL Hard Water Stain Remover

More from CLR


Cleaners Healthy Living App Cleaners Healthy Living App

EWG research
on the go

Find personal care, cleaning, and food products on the EWG Healthy Living app.


EWG research
on the go

Find personal care, cleaning, and food products on the EWG Healthy Living app.